...prosecutors and the Federal Bureau of Investigation face a five-year legal deadline in July to bring securities-fraud charges in an investigation that touches SAC's billionaire founder, Steven A. Cohen.

...

Under RICO, prosecutors could file charges in connection with crimes committed over the past decade, as long as any act that is part of the alleged enterprise occurred within the past five years.

The government has been investigating charges of insider trading by the firm and its founder, Steve Cohen, for years.

SAC told investors last week that it would cease cooperating unconditionally with the government's investigation.